Question 185865
1{{{3/5}}}x - 2{{{1/2}}} = {{{7/10}}}
8X/5-5/2=7/10
8X/5=7/10+5/2
8X/5=(7+5*5)/10
8X/5=(7+25)/10
8X/5=32/10
10*8X=5*32
80X=160
X=160/80
X=2 ans.
Proof:
8*2/5-5/2=7/10
16/5-5/2=7/10
(2*16-5*5)/10=7/10
(32-25)/10=7/10
7/10=7/10